[src/trunk]: src/usr.bin/vmstat "vmstat -ie[v]" auto fit to minimum columns

[ryo <ryo%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7e77adec1d4a
branches:  trunk
changeset: 820264:7e77adec1d4a
user:      ryo <ryo%NetBSD.org@localhost>
date:      Thu Jan 05 07:53:20 2017 +0000

description:
"vmstat -ie[v]" auto fit to minimum columns

Reviewed by msaitoh@

diffstat:

 usr.bin/vmstat/vmstat.c |  82 ++++++++++++++++++++++++++++++++++++++----------
 1 files changed, 64 insertions(+), 18 deletions(-)

diffs (145 lines):

diff -r 6acd13f213a6 -r 7e77adec1d4a usr.bin/vmstat/vmstat.c
--- a/usr.bin/vmstat/vmstat.c   Thu Jan 05 05:53:23 2017 +0000
+++ b/usr.bin/vmstat/vmstat.c   Thu Jan 05 07:53:20 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vmstat.c,v 1.215 2017/01/05 03:42:27 pgoyette Exp $ */
+/* $NetBSD: vmstat.c,v 1.216 2017/01/05 07:53:20 ryo Exp $ */
 
 /*-
  * Copyright (c) 1998, 2000, 2001, 2007 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
 #if 0
 static char sccsid[] = "@(#)vmstat.c   8.2 (Berkeley) 3/1/95";
 #else
-__RCSID("$NetBSD: vmstat.c,v 1.215 2017/01/05 03:42:27 pgoyette Exp $");
+__RCSID("$NetBSD: vmstat.c,v 1.216 2017/01/05 07:53:20 ryo Exp $");
 #endif
 #endif /* not lint */
 
@@ -1216,10 +1216,11 @@
 
        inttotal = 0;
        uptime = getuptime();
-       (void)printf("%-34s %16s %8s\n", "interrupt", "total", "rate");
        nintr = intrnl[X_EINTRCNT].n_value - intrnl[X_INTRCNT].n_value;
        inamlen = intrnl[X_EINTRNAMES].n_value - intrnl[X_INTRNAMES].n_value;
        if (nintr != 0 && inamlen != 0) {
+               (void)printf("%-34s %16s %8s\n", "interrupt", "total", "rate");
+
                ointrcnt = intrcnt = malloc((size_t)nintr);
                ointrname = intrname = malloc((size_t)inamlen);
                if (intrcnt == NULL || intrname == NULL)
@@ -1250,19 +1251,17 @@
        uint64_t counttotal, uptime;
        struct evcntlist allevents;
        struct evcnt evcnt, *evptr;
+       size_t evlen_max, total_max, rate_max;
        char evgroup[EVCNT_STRING_MAX], evname[EVCNT_STRING_MAX];
 
        counttotal = 0;
        uptime = getuptime();
-       if (type == EVCNT_TYPE_ANY)
-               (void)printf("%-34s %16s %8s %s\n", "event", "total", "rate",
-                   "type");
 
        if (memf == NULL) do {
                const int mib[4] = { CTL_KERN, KERN_EVCNT, type,
                    verbose ? KERN_EVCNT_COUNT_ANY : KERN_EVCNT_COUNT_NONZERO };
-               size_t buflen = 0;
-               void *buf = NULL;
+               size_t buflen0, buflen = 0;
+               void *buf0, *buf = NULL;
                const struct evcnt_sysctl *evs, *last_evs;
                for (;;) {
                        size_t newlen;
@@ -1285,33 +1284,80 @@
                                free(buf);
                        buflen = newlen;
                }
-               evs = buf;
+               buflen0 = buflen;
+               evs = buf0 = buf;
+               last_evs = (void *)((char *)buf + buflen);
+               buflen /= sizeof(uint64_t);
+               /* calc columns */
+               evlen_max = 0;
+               total_max = sizeof("total") - 1;
+               rate_max = sizeof("rate") - 1;
+               while (evs < last_evs
+                   && buflen >= sizeof(*evs)/sizeof(uint64_t)
+                   && buflen >= evs->ev_len) {
+                       char cbuf[64];
+                       size_t len;
+                       len = strlen(evs->ev_strings + evs->ev_grouplen + 1);
+                       len += evs->ev_grouplen + 1;
+                       if (evlen_max < len)
+                               evlen_max= len;
+                       len = snprintf(cbuf, sizeof(cbuf), "%"PRIu64,
+                           evs->ev_count);
+                       if (total_max < len)
+                               total_max = len;
+                       len = snprintf(cbuf, sizeof(cbuf), "%"PRIu64,
+                           evs->ev_count / uptime);
+                       if (rate_max < len)
+                               rate_max = len;
+                       buflen -= evs->ev_len;
+                       evs = (const void *)
+                           ((const uint64_t *)evs + evs->ev_len);
+               }
+
+               (void)printf(type == EVCNT_TYPE_ANY ?
+                   "%-*s  %*s %*s %s\n" :
+                   "%-*s  %*s %*s\n",
+                   (int)evlen_max, "interrupt",
+                   (int)total_max, "total",
+                   (int)rate_max, "rate",
+                   "type");
+
+               buflen = buflen0;
+               evs = buf0;
                last_evs = (void *)((char *)buf + buflen);
                buflen /= sizeof(uint64_t);
                while (evs < last_evs
                    && buflen >= sizeof(*evs)/sizeof(uint64_t)
                    && buflen >= evs->ev_len) {
                        (void)printf(type == EVCNT_TYPE_ANY ?
-                           "%s %s%*s %16"PRIu64" %8"PRIu64" %s\n" :
-                           "%s %s%*s %16"PRIu64" %8"PRIu64"\n",
+                           "%s %s%*s  %*"PRIu64" %*"PRIu64" %s\n" :
+                           "%s %s%*s  %*"PRIu64" %*"PRIu64"\n",
                            evs->ev_strings,
                            evs->ev_strings + evs->ev_grouplen + 1,
-                           34 - (evs->ev_grouplen + 1 + evs->ev_namelen), "",
-                           evs->ev_count,
-                           evs->ev_count / uptime,
+                           (int)evlen_max - (evs->ev_grouplen + 1
+                           + evs->ev_namelen), "",
+                           (int)total_max, evs->ev_count,
+                           (int)rate_max, evs->ev_count / uptime,
                            (evs->ev_type < __arraycount(evtypes) ?
-                               evtypes[evs->ev_type] : "?"));
+                           evtypes[evs->ev_type] : "?"));
                        buflen -= evs->ev_len;
                        counttotal += evs->ev_count;
-                       evs = (const void *)((const uint64_t *)evs + evs->ev_len);
+                       evs = (const void *)
+                           ((const uint64_t *)evs + evs->ev_len);
                }
                free(buf);
                if (type != EVCNT_TYPE_ANY)
-                       (void)printf("%-34s %16"PRIu64" %8"PRIu64"\n",
-                           "Total", counttotal, counttotal / uptime);
+                       (void)printf("%-*s  %*"PRIu64" %*"PRIu64"\n",
+                           (int)evlen_max, "Total",
+                           (int)total_max, counttotal,
+                           (int)rate_max, counttotal / uptime);
                return;
        } while (/*CONSTCOND*/ 0);
 
+       if (type == EVCNT_TYPE_ANY)
+               (void)printf("%-34s %16s %8s %s\n", "event", "total", "rate",
+                   "type");
+
        kread(namelist, X_ALLEVENTS, &allevents, sizeof allevents);
        evptr = TAILQ_FIRST(&allevents);
        while (evptr) {